Explosive.



UjlTE %TAT% T @lelhl llil JAMES F. OBRIEN, OF CHICAGO, ILLINOIS.

I EXPLOSIVE.

No Drawing.

ol the class containing an alkali metal chlorate and a carho-hydrate.

'lher are two main ohjects in supplying an insulation coating for explosives. namely; the actual aml physical insulation of the ilitl'erent grain or hotlies otexplosive trom each other; aml the propagation of llame within a )()tl of explosive nnule up of a numher of grains or smaller hotlies. l also. in the particular form of the coating ahout to he explainetl, inclmle an oxiilixer in the material of the insulation coating. which oxidizer materially helps in the propagation of the flame, chiefly perhaps by intlncing the combustion of the com uistihle ele111ent'sol the coating.

'lo t'ullil the aho\'en1entionetl ohjects my insulation coating comprises some material which will physically insulate one particle of explosive from neighboring particles and which is combustible in itself so as to propagate flame in an aggregate of particles. I have t'omul it atlvisahle to use 1111 :uhlitional suhstance as an atlhesive to cause the insulation coating to atlhere closely to the explosive grains; antl, in the particular specilic case in view, l have useil a carho-hydrate as an adhesive, this carho-lryilrate entering easily into the chemical reactions causetl hy the combustion of the explosive itself, the explosive containing a carho-l1ytlrate as one 'ol' its principal constituents. ln ortler to readily oxiilize the comhustihle element of the insulation coating l also may provitle an oxidizing agentin the coating. This is typi cally provided by a small amount 01 )ltl Ll ()Xltl ol manganese.

Although the constituents may he Vttllttl as well as the proportions in which they are nse1l. the l'ollowingis given as a t'ypi fill con stitntion ot my insulation material, as it is useil in connection with my explosive containing a (lll'l)t)ll \tll'2llt 11ml an alkali metal chlorate as principal constituents I use the Specification of Letters Patent.

Patented June ill, 1912.

Application filed October 2, 1911. Serial No. 652,390

coal, or other form) 2 parts. black oxicl of manganese 2 parts. sugar of milk (lactose) 1 part. coating is used may he potassium chlorate 3 parts. sugar 1 part. with or without brick tlust 2 parts.

Lactose is a carho l1 lrate tilltl enters reailily into any chemical reaction hetween the ea1-hoh \'1lrate ot' the explosive proper antl any other constituent thereof. it may he typical of any other carho-hytlrate which will form a mechanica atlhesii'e. Carbon, in the shape of coal or chin-coal tinely powilereth is useil as the hotly of the insulation material antl as a propagator of combustion. lnthis sense it is typi al of other similar materials: hut it is particularly usetnl in my particular comhination with a carho-hydrate explosive as it enters rearlily into the chemical reaction which alreatly (in the explosive itself) includes reactions with carbon. lllaclt oxitl of manganese may be typical of any other oxiilizer which will give the reactions ahove tlescrihetl.

Hy insulation 111aterial may he applied to an explosive in many iliti'erent manners; any methotl sutlicinn' which will cause just enough at the insulation mixture to adhere to the explosive to completely cover its surface. I prefer. however to apply the insulavtion mixture by placing the explosive in itwhile the explosive is in a somewhat doughy aml (lamp condition, this method causing a sutlicient amount of the insulation mixture to adhere without waste. in the preparation of my alkali metal chlorate carbohydrate explosive and at the curl of the mixing process, it in the form of a heavy paste or tlougrh. 'lhis dough is then cut up into small particles antl. before being (tried, is passed through the insulation applying apparatus where the particles come into contact with following proportions: carhon (coal, char- A typical explosive on which this.

the insulation material in the form of apowtle aml pick up sutfieient of this powder to thoroughly coat themselves. The explosive is then (lllCtl and is rcacly for the market.

Having ilescriheil my invention; I claim:

I. Tn combination with an explosive containing' an alkali metal chlorate and a carbolrwlratiy an insulator coating lirmly adhering to the explosive particles anti containing an intlanunahle material, an adhesive earhol1 \tl rate aiul an oxitlizer.

2. In combination with an explosive 0on taming an alkali metal chlorate and a carbohydrate, an insulator coating firmly adherl ing to the explosive particles and composed 5 of carbon, black oxid of manganese and sugar of milk.

3. In combination with an explosive containing an alkali metal chlorate and a carbo- V hydrate, an insulator coating firmly adher- 10 ing to the explosive particles and composed of carbon two parts, black oxid of manganese two'parts and sugar of milk one part. 7 a i In Witness that I claim the foregoing I l have hereunto subscribed my name this 26th day of September 1911. J

JAMES F. OBRIEN.

Witnesses? CORA E. MONTGOMERY, JAMES T. BARKELEW. 

